description HD 40307 d Overview
HD 40307 d is one of the planets first identified around the nearby K-type star HD 40307. It was reported in 2008 from radial-velocity measurements and has a minimum mass of about 9.5 Earth masses, placing it in the super-Earth range. In the original three-planet solution, it was the outermost planet and completed an orbit in approximately 20.4 days. Later studies have examined additional planets in the same system.
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How good is HD 40307 d?
HD 40307 d scores 5.98/10 (Mediocre) on Lunoo, making it rated in the Exoplanet category.
What are the best alternatives to HD 40307 d?
See our alternatives page for HD 40307 d for a ranked list with scores. Top alternatives include: HD 192310 b, HD 40307 c, HD 40307 b.
How does HD 40307 d compare to HD 192310 b?
See our detailed comparison of HD 40307 d vs HD 192310 b with scores, features, and an AI-powered verdict.
Is HD 40307 d worth it in 2026?
With a score of 5.98/10, HD 40307 d is a solid option in Exoplanet. See all Exoplanet ranked.
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